Ashbel a



(No Model.)

A. A. STIMSON.

SPRING TOOTH HARROW.

No. 390,812. Patented 001;. 9, 1888'.

NlTED STATES PATENT Prion.

ASHBEL A. STIMSON, OF MONTPELIER, VERMONT.

SPRING-TOOTH HARROW.

SPECIFICATION forming part of Letters Patent No. 390,812, dated October 9, 1888.

Serial No. 265,982. (1Y0 model.)

To aZZ whom it may concern.-

Be it known that l, ASHBEL A. S'rIMsoN, a citizen of the United States, residing at Moutpelier, in the county of \Vashington and State of Vermont, have invented new and useful Improvements in Spring-Tooth Harrows, of which the following is a specification.

My invention relates to that class of harrowteeth which are secured to the barrow-beam with a joint and held in position bya spring,- and the objects of my improvements are, first, to provide a barrow-tooth which will not allow sods or clods of earth or the dressing of the soil, especially when strawy, to lodge and clog the tooth; second, to so form a tooth and spring as to obtain the desired strength witha less amount of steel than is commonly used; third, to secure a more direct line of draft with the working portion of the tooth; fourth,to afford facilities for the proper adjustment of the length and angle of the tooth in aless amount of time than is commonly required; fifth, to provide a more secure attachment of the tooth to the harrow-beam. I attain these objects by the mechanism illustrated in the accompanying drawings, in which Figure 1 is a perspective view of my improved harrow-tooth attached to a section of the barrow-beam. Fig. 2 is a separate view showing the adjustable ratcheted lug and spring-rod with collar.

Similar letters refer to similar parts in both views.

In the accompanying drawings A represents a beam of the barrow-frame.

B is the barrow-tooth, to which isjointed a flange or lug, 0, provided with bosses b b, as shown by dotted lines, Fig. 1, embedded in barrow-beam A and held in place by bolt a.

Tooth B is slit and swaged at c, forming a seat for spring D, (preferably of a volute form,) and admitting the passage of spring-rod d, which is jointed with the adjustable ratchetlug E and secured to the underside of harrowbeam Aby bolt a. Flange or lug E is slotted to receive bolt a, allowing it to be moved horizontally for the purpose ofadjusting the length and angle of tooth B, and is (in this case) retained after adjustment by ratcheting the lug each side of the slot, Fig. 2, and forming the head of bolt to at an angle to fit the ratcheted sides. On spring-rod d is a tight-fitting collar, 6, so formed as to secure the jointed end of the rod and serve as a stopper to tooth B, and also prevent dirt from getting inside spring D. Spring D, resting 011 back side of tooth B, is held in place and its tension adjusted by means of nutf on spring-rod d.

Tooth B is formed with a straight portion, h, extending down from its joint with lug O to a pointjust below the under side of harrowbeam A, then, forming a right angle, '5, extends back horizontally in straight line j the full length of spring D, thus securing the same from injury by coming in contact with the soil or other obstructions, the base or working portion assuming a C-shaped form, It.

The length and angle of the tooth Bare regulated by loosening nut g on bolt a, allowing the adjustable flange E to be moved horizontally as desired then, tightening the nut, it is held in position.

From the above it will be seen that by this peculiar and novel form of a barrow-tooth the straight portion h is in a perpendicular line with the back side or edge ofthe harrow-beam, andprevents clods or other obstructions from getting behind the beam and clogging, and that the nearly-straight and nearly-horizontal portion j, with upper part of curved portion k, tends to press them hard on the soil and cover them; also, that the draft on the tooth is from the under side of the tooth-beam and in a more directline with the working portion of the tooth, allowing of a less amount of steel to obtain the desired strength, and, owing to the leverage it gives on the tooth, a lighter spring is required to hold it in position, and that the tooth is held in position by a single bolt by having its hearings on both the top and under side of the barrow-beam. This method of securing a barrow-tooth to the frame of a harrow with its spring attachments may be applied to forms of teeth other than that described.

I am aware that prior to my invention harrow-teeth have been pivoted and held forward by springs. I therefore do not claim such a combination, broadly; but 1 \Vhat I do claim as my invention, and desire to secure by Letters Patent, is-

1. A harrow-tooth in form and shape like that shownin Fig. 1, consisting, when in place, of ajoint formed with a lug at the top of the harrow-bean1, thence extending down vertically in the rear of the beam and far enough to form a connection with the spring attachments at the under side of said beam, then turning nearly a right. angle and extending backward nearly horizontally the length of the spring D, thence forming a semicircular or C- shaped curve downward.

2. A harrow-tooth hinged at the upper rear portion of the harrow beam, with a lug attached at the top of the beam and held in position by a spring secured at the underside of said beam, substantially as shown and de scribed.

A barrow-tooth consisting of an eye or hook at the top to attach to the upper side of a harrowbeain a vertical part with a swaged slot at or below the under side of the harrowbeam for the passage of a bolt and forming a seat for the base of the spring, the bolt being hinged with a lug and incased in the spring, the lower portion of the tooth extending backward and then downward from the spring in l a semicircular or Cshaped curve, as shown and described.

i. In combination with a hinged harrowtooth and spring, an adjustable lug formed and adapted to interlock and secure its position to l a barrow-beam and disengage at will, substantially as shown and described.

ASI-IBEL A. STIMSON.

\Vitnesses:

THOMAS J. DEAVITT, Gnonen W. BoL'roN. 

